The WS-X6624-FXS provides 24 FXS ports for analog phones, conference
room speaker phones, and fax machines. The FXS module provides legacy analog
devices with connectivity into the IP network. This connectivity enables the
devices to utilize the IP network infrastructure for toll-bypass applications.
The connectivity also enables the devices to communicate with other devices,
such as IP phones and H.323 end stations.

Cisco Communication Media Module (CMM) is the next generation of voice
gateways and services module for Cisco Catalyst 6500 series switches and Cisco
7600 series routers. Cisco CMM is a modular line card that provides greater
flexibility, better performance, and more density in a single Catalyst 6500
slot.

Note: The recommended Supervisor Engine software version for the
WS-X6624-FXS is CatOS 6.3(7). The WS-X6624-FXS is not supported with Supervisor
Engine 720 in CatOS 8.1(x). But the WS-X6624-FXS is supported with Supervisor
Engine 720 in CatOS 8.2(1) and later.

On the WS-X6624-FXS analog interface module, the
show
spantree command displays the port status as
not-connected. This error does not affect
operation. The problem is resolved in CatOS 7.3(1). For more information, refer
to Cisco bug ID
CSCds00575
(registered customers only)
.

The WS-X6624-FXS analog voice module fails to come online and
register with Cisco CallManager when you use Supervisor Engine CatOS 7.2(2).
This problem is resolved in CatOS 7.3(1). For more information, refer to Cisco
bug ID
CSCdx30559
(registered customers only)
.

Voice modules, such as a WS-X6624-FXS and a WS-X6608-T1/E1, fail to
register with Cisco CallManager if you use a WS-X6148-GE-TX for the CallManager
connection. Use another type of module, such as a WS-X6148-RJ45V, for the Cisco
CallManager connection. This problem is resolved in Cisco CallManager Version
3.3(3)sr1. For more information, refer to Cisco bug ID
CSCeb38168
(registered customers only)
.

If you issue the
show
port command on a switch with voice modules, such as
WS-X6624-FXS and WS-X6608-T1, the show port command
appears to hang. Also, port information for the voice module does not print.
And, at times, the digital signal processor (DSP) on the voice module can
reset. This problem is resolved in CatOS 8.3(3). For more information, refer to
Cisco bug ID
CSCec01126
(registered customers only)
.